The nucleus of M31 may be a thick eccentric disk, composed of stars traveling on nearly Keplerian orbits around a black hole or other dark compact object. This hypothesis reproduces most of the features seen in HST photometry of the center of M31; in particular the bright o center source P1 is the apoapsis of the disk. An eccentric disk can also explain the rotation curve and asymmetric dispers...

Most of the time, mass eccentricity, and misalignment exist at same time with aviation spline coupling working. Therefore, in this paper, function dynamic meshing force between multi-teeth a non-linear model involute system aero-engine eccentricity were presented. And then, on different was investigated. The result shows that when are both small, can run steady. increase or misalignment, load c...

In a graph G=(V; E), the eccentricity e(v) of a vertex v is max{d(v; u): u∈V}. The center of a graph is the set of vertices with minimum eccentricity. A house–hole–domino-free (HHD-free) graph is a graph which does not contain the house, the domino, and holes (cycles of length at least 2ve) as induced subgraphs. We present an algorithm which 2nds a central vertex of a HHD-free graph in O( 1:376...

Taking the total angular momentum conservation in place of the tangential momentum conservation, and considering the square and higher power terms of orbital eccentricity e, the changes of orbital elements of binaries are recalculated for wind accretion scenario. These new equations of orbital elements are used to calculate the properties of barium stars. Our results show that, during the evolu...

As a planet transits the face of a star, it accelerates along the line of sight. The changing delay in the propagation of photons produces an apparent deceleration of the planet across the sky throughout the transit. This persistent transverse deceleration breaks the time-reversal symmetry in the transit light curve of a spherical planet in a circular orbit around a perfectly symmetric star. Fo...

Chronometric geodesy applies general relativity to study the problem of the shape of celestial bodies including the earth, and their gravitational field. The present paper discusses the relativistic problem of construction of a background geometric manifold that is used for describing a reference ellipsoid, geoid, the normal gravity field of the earth and for calculating geoid’s undulation (hei...

In this paper, a novel method for ranking of fuzzy numbers are proposed. In this method, decision maker is defined based on the center of mass at some cuts of a pair of fuzzy numbers in discreet version and center of mass on all of cuts of a pair of fuzzy numbers in continuous version. Our method can rank more than two fuzzy numbers simultaneously. Also, some properties of methods are described...

In this paper, we study the existence of families odd symmetric periodic solutions in generalized elliptic Sitnikov (N+1)-body problem for all values eccentricity e∈[0,1) using global continuation method. First, obtain properties period solution corresponding autonomous equation (eccentricity e=0) functions. Then, according to these and method zeros a function depending on one parameter, derive...